JPH0532205B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention cuts a narrow veneer having defective parts such as irregular edges, cracks, knot holes, etc. into sized pieces while being intermittently conveyed by a conveyor. At the same time, the servo is applied to a veneer cross-cutting machine that applies adhesive to the end surface or sticks adhesive thread to the surface of the veneer, joins them together in a blind shape, and cuts them to a fixed width and stacks them. This invention relates to a conveyor drive control device using digital control of a motor.

[Conventional technology]

For conventional veneer horizontal stripping machines, for example,
No. 48-77483 Cutting device for veneer veneer and cutting/
This type of conventional technology disclosed in the butting device etc. is described in the seventh section.
As illustrated in the figure, the conveyor 15 that intermittently conveys the narrow veneer 1 has an electromagnetic clutch brake 1.
6 and a motor 17, etc., and is not equipped with an encoder for feedback control, and has only a so-called open-loop transport control function, the intermittent transport characteristics are As illustrated in FIG. 8, the acceleration time Ta for reconveying the narrow veneer 1 that has been cut first by the conveyor 15, and the conveyor 15 of the narrow veneer 1 to be cut next
The deceleration and positioning time td for positioning is a rapid acceleration and deceleration of about 10 ms in order to pursue high speed and high precision. Therefore, the conveyance posture of the narrow veneer 1 during the conveyance process is as illustrated in Fig. 9. In addition, even if the conveyor 15 is pinching and conveying from above and below, the narrow width veneer 1 is affected by the inertia of the narrow width veneer 1 during acceleration and deceleration.
An unstable slip occurs due to the difference in frictional resistance between the conveyor 15 and the conveyor 15, and the amount of conveyance on the left and right is irregularly disturbed, resulting in diagonal cuts and bends, and the front and rear edges that could normally be obtained are It was not possible to cut into intermediate products with the maximum effective width W1 in a parallel position, and most of them were cut into intermediate products with a short width W2 that were deformed into parallelograms, resulting in wasteful cut-off parts as shown by diagonal lines. When joining the narrow width veneers 1 cut into the parallelogram-shaped intermediate product with the short width W2 into a blind shape, as shown in FIG. Therefore, in order to avoid core shortage due to the unevenness of the saw blade, the cutting width W is significantly narrower than the above-mentioned score width W3.
4 side splicing product 1b must be obtained, or the initial width W3 of the veneer must be lengthened by the lack of core, which significantly reduces the plywood yield and veneer yield. This is what I used to do.

[Problem to be solved by the invention]

As mentioned above, the conveyor drive control device in the conventional veneer cross-cutting machine has only a so-called open-loop conveyance control function, which consists of an electromagnetic clutch brake, a motor, etc., and is not equipped with an encoder for feedback control. As the standard practice was to equip an intermittent drive mechanism, the 10 m
Due to the rapid acceleration/deceleration movement of about 1000 s, the left and right conveyance of the narrow veneer is irregularly disturbed, resulting in diagonal cutting and bending, and the wasteful cutting portions are removed from both the edges of the intermediate product and the side-splitting product. In order to eliminate the problem of causing the veneer to appear one after the other at each end of the wood, which significantly lowers the veneer yield and plywood yield, the present invention uses a so-called closed-loop system that is equipped with encoders for feedback control at each acceleration/deceleration of the conveyor. An intermittent drive mechanism consisting of a servo motor with a built-in encoder and a digital control circuit, which is equipped with a conveyance control function, can be set arbitrarily from 40 ms to about 200 ms, preferably irregularly in the left and right conveyance amount of narrow veneer. A buffer acceleration time close to 40ms that maintains high productivity by setting the shortest possible acceleration time without causing disturbance, or a buffer acceleration time of 80ms or more up to about 200ms, preferably for the left and right conveyance of a narrow veneer. By providing a buffer deceleration positioning time close to 80ms, which can maintain high productivity and high positioning accuracy by setting the deceleration positioning time as short as possible without causing irregular disturbances, The purpose of this is to complete precision parallel cutting operation by precision parallel conveyance operation of veneer.

[Means to solve the problem]

In order to achieve the above object, the present invention configures a conveyor drive control device into an intermittent drive mechanism equipped with a so-called closed-loop conveyance control function using a servo motor with a built-in encoder and a digital control circuit. A buffer acceleration/deceleration time that can be arbitrarily set is given to each of the steps.In other words, the present invention provides an acceleration operation for carrying in and retransporting the previously cut narrow width veneer by the conveyor. At least 40ms or more
A buffer acceleration time of up to about 200 ms, preferably close to 40 ms, which can maintain high productivity by setting the shortest possible acceleration time without causing irregularities in the left and right conveyance of the narrow veneer. and preferably a horizontal conveyance amount of at least 80 ms to about 200 ms during the deceleration operation for positioning the narrow veneer to be cut next by the carrying in and out conveyor. It is possible to set a buffer deceleration positioning time close to 80ms, which maintains high productivity and high positioning accuracy by setting the shortest possible deceleration positioning time without causing irregular disturbances. The conveyor is configured to be driven intermittently by a servo motor and a digital control circuit.

The digital control circuit is equipped with a servo drive unit that drives the servo motor, a servo controller for positioning, a servo parameter memory for initial settings, and a sequencer for command control. A veneer detector is installed between the rows of the conveyor so as to be able to detect the cut point of the narrow veneer, and the veneer detector is connected to a sequencer of a digital control circuit.
Furthermore, an electromagnetic clutch brake, a servo motor, or a pneumatic brake is attached to each of the crankshaft of the clipper that cuts the narrow veneer to a specified width, and the crankshaft of the waste separation conveyor installed between the clipper and the discharge conveyor. This is a drive control device for a conveyor in a veneer cross-cutting machine, which is equipped with an intermittent drive mechanism consisting of a cylinder, hydraulic cylinder, etc.

[Effect]

Since the present invention is configured as described above, the intermittent conveyance characteristics when the loading and unloading conveyors are intermittently controlled by the servo motor and the digital control circuit are such that the cutting is performed first as illustrated in FIG. During the acceleration operation for carrying in and reconveying the finished narrow veneer by the conveyor, the speed is at least 40 ms to about 200 ms, preferably without causing irregular disturbances in the left and right conveyance of the narrow veneer. A buffer acceleration time Ta close to 40 ms can be set to maintain high productivity by setting the shortest possible acceleration time, and also for positioning the narrow veneer to be cut next by the loading and unloading conveyor. During the deceleration operation, the deceleration positioning time is set at least 80 ms to about 200 ms, preferably as short as possible without causing irregularities in the left and right conveyance amount of the narrow veneer, to achieve high productivity and high productivity. It is possible to set a buffer deceleration positioning time Td close to 80ms that maintains positioning accuracy. Therefore, during the conveyance process of the narrow veneer by the loading and unloading conveyor, the conventional device can quickly accelerate and decelerate the narrow veneer. The device of the present invention completely prevents diagonal cutting and bending due to irregularly disturbed left and right conveyance amounts by using the precision parallel conveyance operation and precise parallel cutting operation using the servo motor and digital control circuit. As illustrated in FIGS. 3 and 4, not only was it possible to obtain an intermediate product with a maximum effective width W5 of the narrow width veneer 1 with the front and rear edges parallel to each other with a high yield, but also Apply an adhesive such as hot melt resin to the end surface of the intermediate product, or attach an adhesive thread impregnated with adhesive such as hot melt resin to the board surface of the intermediate product to make the mutual narrow veneers 1 into a blind shape. When joining to the side-splitting product 1b, the cutting width W4 of the horizontal-splitting product 1b is aligned with the creasing width W3 of the narrow width veneer 1 at the time of cutting the veneer, without producing saw-blade-like unevenness on both ends. We were able to obtain this product with a good yield.

In addition, in the present invention, the reason why the minimum value of the buffer acceleration time Ta is specified to be about 40 ms and the minimum value of the buffer deceleration positioning time Td is specified to be about 80 ms is that This is because we confirmed a safe acceleration time that does not cause irregular disturbances in the left and right transport amount during the transport operation, and a safe deceleration time until positioning is completed, and the reason why we characterized the maximum value as approximately 200ms. This is because the reduction in productivity of the veneer cross-cutting machine due to the delay in acceleration/deceleration time is suppressed to an economically acceptable range of acceleration/deceleration time.

〔Example〕

FIG. 1 shows an example of the implementation of the present invention. First, the veneer horizontal stripping machine carries in a narrow veneer 1 having defective parts such as irregular edges, cracks, knot holes, etc. onto a conveyor 2a. It is possible to detect irregular edges of the narrow veneer 1 to be cut and separated, defective parts such as cracks, knot holes, etc. by thickness or shape between the rows of the carrying-in conveyor 2a while loading it on top and starting conveyance. A single plate detector 9 consisting of a limit switch, a photoelectric switch, etc. installed on the
The detection signal is transmitted to the sequencer 8 of the digital control circuit 4, and the sequencer 8 activates the clipper 10 and the waste separation conveyor 12 to cut it into intermediate products of a certain width,
The chips are separated and delivered onto the carry-out conveyor 2b. On the other hand, a spot applicator 19 for applying an adhesive such as hot melt resin to the end surface of the intermediate product during the conveyance process, and a thread nozzle 20 for feeding adhesive thread impregnated with the adhesive onto the board surface are installed on the carry-out conveyor 2b. Furthermore, a braking rail member 21 is connected to the exit side of the carry-out conveyor 2b to apply a braking force to the intermediate products in the extrusion process and join the intermediate products to the cross-separated product 1b. There is. Further, the blind-shaped cross-cut product 1b discharged from the brake rail member 21 is cut into a desired fixed size by a clipper 22, and is dropped and deposited at a predetermined location by a relay conveyor 23 and an opening/closing conveyor 24 to form a stacked product 1c. Become. In the figure, 11 is a crankshaft that moves the clipper 10 up and down, 13 is a crankshaft that opens and closes the waste separation conveyor 12, and 14 is a crankshaft that moves the clipper 10 up and down.
a, 14b, an intermittent drive mechanism comprising an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc., which are capable of controlling the crankshafts 11, 13 by one turn and half a turn; 25, which moves the clipper 22 up and down; 26 is an intermittent drive mechanism consisting of an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc., which is capable of controlling the crankshaft 25 once; 27 is for detecting the standard length of the side-separated product 1b; It is a single-plate detector consisting of a limit switch, a photoelectric switch, etc.

Therefore, the conveyor drive control device of the present invention in the veneer cross-cutting machine described above at least performs an acceleration operation for carrying in the previously cut narrow veneer 1a and retransporting it by the unloading conveyors 2a and 2b. 40 ms to about 200 ms, preferably close to 40 ms to maintain high productivity by setting the shortest possible acceleration time without causing irregularities in the left and right conveyance amount of the narrow veneer 1a. The buffer acceleration time Ta can be set, and is at least 80 ms or more during the deceleration operation for positioning the narrow veneer 1a to be cut next by the conveyors 2a and 2b.
Up to about 200ms, preferably the narrow veneer 1
Set the buffer deceleration positioning time Td close to 80ms to maintain high productivity and high positioning accuracy by setting the shortest possible deceleration positioning time without causing irregular disturbances in the left and right conveyance amount of a. Possibly, the carry-in and carry-out conveyors 2a, 2b are configured to be driven intermittently by servo motors 3a, 3b and a digital control circuit 4. That is, the servo of the carrying-in and carrying-out conveyors 2a, 2b is carried out in conjunction with the sizing cutting operation of the narrow width veneer 1a and the chip separating operation by the clipper 10 and the scrap separating conveyor 12 of the veneer horizontal stripping machine of the present invention. The intermittent drive control by the motors 3a, 3b and the digital control circuit 4 is performed by a servo parameter memory 7a for initial setting built into the digital control circuit 4,
7b, as shown in the flowchart illustrated in FIG.
A deceleration positioning time of ms and a conveyance speed of, for example, 40 m/ml are set in advance. After that, the servo motors 3a and 3b of the loading and unloading conveyors 2a and 2b are connected to the servo parameter memories 7a and 7b of the digital control circuit 4, the servo controllers 6a and 6b, and the servo drive unit 5.
a, 5b, the narrow width veneers 1, 1a on the carry-in conveyor 2a resume conveyance, and the veneer detector 9 detects irregular edges, cracks, knot holes, etc. to be cut and separated. A defective part is detected, and the detection signal is sent to the sequencer 8 of the digital control circuit 4.
is transmitted to the servo parameter memory 7.
a, 7b and the servo controllers 6a, 6b
and the servo drive units 5a, 5b control the intermittent drive of the servo motors 3a, 3b, and one of the intermittent drive mechanisms 14a, 14b mounted on the crankshafts 11, 13 of the clipper 10 and waste separation conveyor 12. Since rotation control and half-rotation control are performed alternately according to the flowchart of the cutting operation illustrated in FIG. 4, it has become possible for the first time to sequentially and orderly deliver intermediate products that have been conveyed in precise parallel and cut in precise parallel onto the delivery conveyor 2b.

[Effects of the Invention] As explained above, the present invention uses an intermittent drive mechanism consisting of a servo motor with a built-in encoder and a digital control circuit, which is equipped with a so-called closed-loop conveyance control function, at each time of acceleration or deceleration of the conveyor. Any settable 40ms or more 200
It is possible to maintain high productivity by setting the shortest possible acceleration time to about ms, preferably without causing irregularities in the left and right conveyance amount of the narrow veneer.
Buffer acceleration time close to 40ms or more than 80ms 200m
It is possible to maintain high productivity and high positioning accuracy by setting the deceleration and positioning time as short as possible without causing irregularities in the left and right conveyance amount of the narrow veneer, preferably up to about 1.5 seconds. By providing a buffer deceleration positioning time close to 80 ms, it is possible to complete precise parallel cutting operations using precise parallel conveyance operations for narrow width veneers for the first time, which is superior to conventional veneer horizontal stripping machines. This was caused by an intermittent drive mechanism, such as a conveyor drive control device, which only had a so-called open-loop conveyance control function, which consisted of an electromagnetic clutch brake and a motor, and was not equipped with an encoder for feedback control. Due to the rapid acceleration and deceleration of about 10ms caused during the conveyance process of the narrow width veneer, the left and right conveyance amount of the narrow width veneer is irregularly disturbed, causing diagonal cuts and bends, resulting in unnecessary cut-off points. This has completely eliminated the problem of causing the veneer to appear successively on both ends of the intermediate product and on both ends of the side-splitting product, which significantly lowers the veneer yield and plywood yield. Not only was it possible to significantly improve the veneer yield by minimizing the portions of each narrow veneer that was cut, but the cutting width of the side-splitting product also matched the original crease width of the narrow width veneer when the veneer was cut. This is an extremely remarkable implementation effect in that the overall plywood yield and veneer yield were significantly improved by completely eliminating core shortages due to saw-blade-like irregularities after the plywood product was manufactured.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating the drive control device of the present invention, and FIG. 2 is a diagram of intermittent conveyance characteristics of the conveyor.
Fig. 3 is a plan view of the intermediate product that has been cut, Fig. 4 is a plan view of the joined horizontal product, Fig. 5 is a flowchart of the initial settings, and Fig. 6 is a flowchart of the cutting operation. , Fig. 7 is a side view illustrating a conventional drive control device, Fig. 8 is a diagram of the intermittent conveyance characteristics of the conveyor, Fig. 9 is a plan view of the cut intermediate product, and Fig. 10 is the same joined product. FIG. 3 is a plan view of a side-separated product. 1, 1a...Small single plate, 2a...Incoming conveyor, 2b...Outgoing conveyor, 3a, 3b...Servo motor, 4...Digital control circuit, 5a, 5
b... Servo drive unit, 6a, 6b...
Servo controller, 7a, 7b... Servo parameter memory, 8... Sequencer, 9...
Single plate detector, 10... Clipper, 11, 13...
... Crankshaft, 12 ... Waste separation conveyor, 14
a, 14b...Intermittent drive mechanism, Ta...Buffer acceleration time, Td...Buffer deceleration positioning time.

Claims (1)

[Claims] 1. A conveyor 2a for carrying in and carrying out the narrow veneer 1,
In the veneer cross-cutting machine, which cuts the veneer to a specified width while being intermittently conveyed by the veneer 2b, joins each other in a blind shape, cuts the veneer to a fixed length, and stacks the veneer, the small-width veneer 1a that has been cut first is carried in. and unloading conveyor 2a,
At least during the acceleration operation for reconveying by 2b
40ms or more up to about 200ms, preferably 40m
It is possible to set a buffer acceleration time Ta close to s, and at least 80 ms to about 200 ms during the deceleration operation for positioning the narrow veneer 1a to be cut next by the loading and unloading conveyors 2a, 2b. The invention is characterized in that the loading and unloading conveyors 2a, 2b are intermittently driven by servo motors 3a, 3b and a digital control circuit 4 so that a buffer deceleration positioning time Td preferably close to 80 ms can be set. Conveyor drive control device for veneer horizontal stripping machine. 2 The digital control circuit 4 includes a servo motor 3
Servo drive unit 5 that drives a and 3b
The veneer horizontal stripping machine according to claim 1, comprising: a, 5b, servo controllers 6a, 6b for positioning, servo parameter memories 7a, 7b for initial setting, and a sequencer 8 for command control. Conveyor drive control device. 3 Between the rows of the carry-in conveyor 2a, a veneer detector 9 is installed to be able to detect the cut point of the narrow veneer 1, and the veneer detector 9 is connected to the sequencer 8 of the digital control circuit 4. A drive control device for a conveyor in a veneer crosscutting machine according to claim 1. 4 Clipper 1 that cuts the narrow veneer 1 into a specified width
0 crankshaft 11, and a waste separation conveyor 1 installed between the clipper 10 and the discharge conveyor 2b.
The veneer horizontal stripping machine according to claim 1, wherein each of the two crankshafts 13 is equipped with an intermittent drive mechanism 14a, 14b consisting of an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc. Conveyor drive control device.